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session.go
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session.go
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package main
import (
"crypto/rand"
"encoding/base64"
"io"
"sync"
"time"
)
type SessionStore struct {
sync.Mutex
sessions map[string]*Session
}
func NewSessionStore() *SessionStore {
return &SessionStore{sessions: make(map[string]*Session)}
}
func (ss *SessionStore) Set(sid string, session *Session) {
ss.Lock()
defer ss.Unlock()
ss.sessions[sid] = session
}
func (ss *SessionStore) Get(sid string) *Session {
ss.Lock()
defer ss.Unlock()
if v, ok := ss.sessions[sid]; ok {
v.timeAccessed = time.Now()
return v
}
return &Session{isNew: true}
}
func (ss *SessionStore) Delete(sid string) {
delete(ss.sessions, sid)
}
func (ss *SessionStore) Reset() {
ss.Lock()
defer ss.Unlock()
ss.sessions = make(map[string]*Session)
}
func (ss *SessionStore) GC() {
ss.Lock()
defer ss.Unlock()
for sid, session := range ss.sessions {
if (session.timeAccessed.Unix() + session.maxLifetime) < time.Now().Unix() {
delete(ss.sessions, sid)
}
}
}
type Session struct {
sync.Mutex
sid string // unique session id
timeCreated time.Time // last access time
timeAccessed time.Time // last access time
value map[interface{}]interface{} // session value stored inside
isNew bool
maxLifetime int64
}
func (s *Session) Update() {
s.Lock()
defer s.Unlock()
s.timeAccessed = time.Now()
}
func NewSession(value map[interface{}]interface{}) *Session {
s := &Session{}
s.sid = CreateSessionId()
s.timeCreated = time.Now()
s.value = value
s.isNew = true
return s
}
func CreateSessionId() string {
b := make([]byte, 32)
if _, err := io.ReadFull(rand.Reader, b); err != nil {
return ""
}
return base64.URLEncoding.EncodeToString(b)
}